A sewer with a flow of 8 cfs enters Manhole 2. The distance downstream to Manhole 3 is 380 ft. The finished street surface elevation at Manhole 2 is 135.0 ft; at Manhole 3 it is 133.9 ft. Note that the crown of the pipe must be at least 6 ft below the street surface at each manhole. For a Manning's n = 0.013, find the required standard size pipe to carry the flow under
(a) full flow and
(b) one-half full flow. The flow velocity must be at least 2 ft/s and must not exceed 10 ft/s.
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